Correct, DNG Profile Editor doesn't support PV 2012 rendering. (This is actually probably a good thing, since the DNG PE is about defining the baseline color response, rather than judging the combined effect of the color profile + ACR adjustments.)

I use DPE also for custom adjustments to individual photos, and have a way of "hiding" the multitude of per-photo profiles so they don't pollute the global profile names list. That's when viewing the image with adjustments is really helpful.